Gas explosion lower limit is 5%, higher than gasoline (lower explosive limit for l %), methane ignition point is 645 ℃, higher than gasoline ignition point 218 ℃, compared to is not easy to ignite. Low methane density, relative density is about 0.55, the leakage of gas will soon be in the air, and the explosion limit range is narrow and difficult to form in the natural environment in hot conditions, once compressed natural gas from the storage tank or pipe leakage, leakage point immediately to form low temperature zone around, make gas combustion difficult.
1、有显著的社会和经济效益
1, a significant social and economic benefits
a、可降低汽车运营成本。一辆汽车改装为压缩天然气、汽油两用燃料汽车由于油气差价的存在，每年可节约燃料费约1.1万元，如今已发展30多万辆汽车，每年可节约33亿元。
A, can reduce vehicle operating costs. A car modification for compressed natural gas, gasoline dual fuel vehicle as a result of the existence of oil and gas price difference, can save fuel cost about $11000 a year, now has developed more than 30 cars, can save 3.3 billion yuan each year.
b、可代替大量汽油。按一辆中型车年行驶5万公里计算，可替代约10.5吨汽油，发展30万辆，可替代汽油315万吨。
B, can replace a lot of petrol. Calculated on a mid-size car driving 50000 km, the alternative is about 10.5 tons of gasoline, development, 300000, 3.15 million tons of alternative to petrol.
C、可促进天然气的充分利用。过去许多的伴生气和偏远井，低产井所产天然气因不具集输价值，被白白浪费。通过发展压缩天然气，建设子母站可充分利用这些零散气。
C, can promote the full use of natural gas. The past many of the associated gas and remote Wells, gas from the stripper well not worth gathering, is wasted. Through the development of compressed natural gas construction lash station can make full use of these scattered gas.
d、可节省汽车的维修费用。汽车发动机使用天然气做燃料，运行平稳、噪音低、不积炭，能延长发动机使用寿命，不需经常更换机油，可节约50%的维修费。
D, car maintenance costs can be saved. Automobile engine using natural gas as fuel, smooth operation, low noise, no carbon deposit, can prolong the service life of the engine, often do not need to change the oil, can save 50% of the maintenance costs.
此外，汽车油改气的发展还将带动相关产业，特别是机器制造的发展，如压缩机、车用燃气装置以及储气瓶的生产，为开创新兴产业提供了机遇。
In addition, jinan car oil to gas will also drive the development of related industries, especially the development of machine manufacturing, such as compressors, automotive gas device and storage cylinder production, provides opportunities to create a new industry.
